Abstract

An ultra-compact polarization splitter–rotator with a discretized subwavelength nanostructure is demonstrated on the silicon-on-insulator platform. The device has a length of only 7.92 μm. For TE0TE0, a low insertion loss (<0.2  dB), low crosstalk (<20  dB), and high extinction ratio (>40  dB) are achieved over a broad wavelength range from 1500 nm to 1600 nm. For TM0TE0, the insertion loss is lower than 1 dB over 40 nm bandwidth (1530–1570 nm). The crosstalk is lower than 25  dB, and the extinction ratio is larger than 20 dB, from 1500 nm to 1600 nm.

© 2019 Optical Society of America

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